Find the angle between each of the following pairs of vectors a⃗ =axi^+ayj^ and b⃗ =bxi^+byj^.. ax1= -3.20, ay1= 4.40; bx1= 2.70, by1= -3.10. i know this is dot prodoct but the calculater just keep saying error

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.